| Full text | |
| Author(s): |
Peris, Santiago
;
Boito, Diogo
;
Golterman, Maarten
;
Maltman, Kim
Total Authors: 4
|
| Document type: | Review article |
| Source: | MODERN PHYSICS LETTERS A; v. 31, n. 30 SEP 28 2016. |
| Web of Science Citations: | 5 |
| Abstract | |
In this review, we discuss why, in the determination of alpha(s)(m(tau)(2)) from hadronic tau decays, two important assumptions made in most of previous analyses, namely the neglect of higher-dimension condensates and of duality violations (DVs), have introduced uncontrolled systematic errors into this determination. Although the use of pinched weights is usually offered as a justification of these assumptions, we explain why it is not possible to simultaneously suppress these two contributions; particularly since the Operator Product Expansion (OPE) is expected to be an asymptotic, rather than a convergent expansion. There is not only experimental and theoretical evidence for DVs but they also affect the extraction of alpha(s)(m(tau)(2)). (AU) | |
| FAPESP's process: | 15/20689-9 - Precise determination of fundamental QCD parameters |
| Grantee: | Diogo Rodrigues Boito |
| Support Opportunities: | Research Grants - Young Investigators Grants |